Barrel nut



FIG. 1 is a perspective view of a barrel nut according to the disclosure;

FIG. 2 is a perspective view thereof;

FIG. 3 is a side view thereof;

FIG. 4 is a cross-sectional view thereof;

FIG. 5 is a front view thereof; and,

FIG. 6 is a rear view thereof. 

CLAIM We claim the ornamental design for a barrel nut, as shown and described. 